Greyline HF vertical standing in open ground; the HD Series is the same antenna on a heavy-duty base, built for wind

20' HD | Heavy-Duty Greyline HF Vertical, 160-6M

Regular price: $1,995.00
Sale price: $1,995.00

HD Series · Heavy-Duty · 20 Feet · 160-6M · No Radials · Made in USA

The 20' HD: The Strongest Greyline We Build.

Every band 160 through 6 from a single feedpoint, no radials, on an oversized heavy-duty base. At 20 feet it keeps a low profile for strict height limits and stands up to the worst weather on the coast, the plains and the ridgelines.

About 124 MPH at 20 Feet · Now Taking Orders

Our engineering model puts the 20' HD at about 124 mph, against 90 mph for the standard 20-foot vertical. Ships in 1-2 weeks with free shipping to the USA and Canada. That figure is a preliminary engineering estimate; the PE-certified rating will be published here when complete.

Which 20-Footer? Same Antenna, Two Builds

	20' DX Vertical	20' HD
Signal	Identical: every band 160-6M, same feedpoint
Wind	90 mph (ASCE 7-10)	About 124 mph*
Tilt	Tilt-Up Base	3" HD Tilt-Up Base

*Preliminary engineering estimate; PE-certified rating to follow. Not sure which your site needs? Call 435-200-4902.

Every Band, From One Feedpoint

Every Greyline works every band, 160 through 6. At 20 feet the antenna also runs ahead of a full-radial quarter-wave on 20 through 10 meters in NEC modeling over average ground, strongest on 10. The Greyline is a vertical dipole: return current flows through the lower element, not a buried radial field, so frozen ground, rock and sand don't matter.

Specs

Height	20 feet
Pole	Oversized heavy-duty base, 6061-T6 aluminum, stainless hardware
Bands	Every band, 160-6M, one feedpoint
Radials	None
Wind	About 124 mph (preliminary engineering estimate); PE-certified rating to follow
Foundation	Heavy-duty concrete foundation, set plumb; drawing included with your order; PE-designed foundation for exposed or critical sites
In the box	20' HD radiator with top truck, feedline kit (ladder line, five snap-on ferrites, ladder-line to PL-259 adapter, spacers)
Ships	In 1-2 weeks; free to the USA and Canada
Warranty	7 years

Ham Radio is fun again! Pass it on… 73, Jon KL2A · Greyline Performance · 435-200-4902

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Essential for every antenna

This turns all antenna work into easy one-man jobs. It also makes storm prep easy - just drop the antenna for the storm, raise it later. It takes less than 5 minutes to go up or down. I can't imagine having an antenna without one. I'm old enough that climbing towers, trees or big ladders just isn't in the playbook any longer, so this is a life-saver for my hobby. Buy one and make your life easier and add years to your ability to work on your antenna. Five Stars!!

Thank you, Rob. “Essential” is exactly the word we hoped for. One tip from another owner: walk it down once a season on a calm day and check the hardware at chest height. Fun season ahead! 73, Jon KL2A

Should be part of every antenna

The tilt base makes it possible to raise and lower the antenna in minutes single-handed with complete safety. The design is simple and robust and I love the fact that it can't over-shoot when raising it. In fact, it is seriously over-built. The only help I needed to install it was lowering the antenna to add the unit. It does raise the halyard cleat but I simply removed it, left the bolts in the original holes and mounted it at a comfortable level with a stainless hose clamp, problem solved. No more worries about the antenna during storms here in Florida. Five minutes and it's on the ground out of the wind.

Great addition to My 20V!

After 2 weeks of use I can safely say that the 9' whip is a great addition to my 20V! My rough calculations show about a 2+ db improvement overall. On the receive side the most dramatic indicator is that I am getting approximately the same signal strength without the preamp on most bands. I am also getting more reports in the + range on FT8 than previously. I have used PSK reporter to get a general picture of my RF footprint and signal strength compared to to the original 20v w/ previous reports. I have also been able to work several new countries that I could not work previously...India, Franz Joseph Land, Kahazakistan. India is certainly not rare but it has taken me three years to eliminate my "blind spot". Swr is well below 1.3/1 on all bands 80m-6m using the LDG RT-100 at the antenna. All in all could not be more pleased with the 9" whip addition!

Franz Josef Land and Kazakhstan on nine more feet — that's the report every whip page wishes it had. Thank you, Craig. Your words are on the page now. 73, Jon KL2A

Better base.

I want a 6ft x 18in hole. That is what the backhoe bucket is going to dig. I will need my own base tube, and a whole lotta concrete! I bought this extender to allow a more accurate vertical alignment while dumping in the concrete.

A 6-foot hole will hold anything we build. One tip while the concrete goes in: check plumb from two directions, 90° apart, then leave it alone for 24 hours. Send us a photo when it’s up! 73, Jon KL2A

Product is good. But I need a quick instruction sheet. You remove the bottom tube and replace it with the antenna base. Then the tube you removed connects the the top of the arm and to the insulated base of the antenna. Now I can lower my 24’ antenna without help.

Thank you, Dale. You were right, so we made one: the one-page Tilt-Up Base Instructions (install, lower, raise) now sit on the product page, because of your review. Have the best season yet! 73, Jon KL2A

20' HD | Heavy-Duty Greyline HF Vertical, 160-6M

The 20' HD: The Strongest Greyline We Build.

Every Band, From One Feedpoint

Specs

Customer Reviews

Let customers speak for us